I think it's because it's work. Its hard to have any positive feelings toward a tool used primarily to talk to annoying coworkers and bosses. It doesn't matter how good it bad it is.
You might already know this, but you can use a Kagi without logging in on private tabs using a "session link" that looks like https://kagi.com/search?token=[LONG TOKEN HERE]. (Of course, this session link is not perfectly anonymous because the token is presumably tied to your account.)
People are in denial downvoting you. The useful stuff is still mostly on Reddit. I'm committed to the decentralized option but there's no use pretending.
Another way to tell the difference is tasting them